Fifteen successive heats of a steel alloy are tested for hardness. The resulting data are shown in Table 5E.9. Set up a control chart for the moving range and a control chart for individual hardness measurements. Is it reasonable to assume that hardness is normally distributed?
Answer to relevant QuestionsDiscuss type I and type II errors relative to the control chart. What practical implication in terms of process operation do these two types of errors have? a. Estimate the process standard deviation. In exercise The length of time required to reimburse employee expense claims is a characteristic that can be used to describe the performance of the process. Table 5E.16 gives the cycle times (in days) of 30 randomly selected employee ...Why is the np chart not appropriate with variable sample sizes?
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